EP3990850A1 - Tube cleaning robot - Google Patents
Tube cleaning robotInfo
- Publication number
- EP3990850A1 EP3990850A1 EP20735665.0A EP20735665A EP3990850A1 EP 3990850 A1 EP3990850 A1 EP 3990850A1 EP 20735665 A EP20735665 A EP 20735665A EP 3990850 A1 EP3990850 A1 EP 3990850A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- carriage
- robot
- tubes
- shaft
- traction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 11
- 238000000429 assembly Methods 0.000 claims abstract description 27
- 230000000712 assembly Effects 0.000 claims abstract description 26
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims abstract description 3
- 230000007246 mechanism Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000017899 Spathodea campanulata Nutrition 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/04—Feeding and driving arrangements, e.g. power operation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/023—Cleaning the external surface
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G1/00—Non-rotary, e.g. reciprocated, appliances
- F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G1/00—Non-rotary, e.g. reciprocated, appliances
- F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
- F28G1/166—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris from external surfaces of heat exchange conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/003—Control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/02—Supports for cleaning appliances, e.g. frames
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2209/00—Details of machines or methods for cleaning hollow articles
- B08B2209/02—Details of apparatuses or methods for cleaning pipes or tubes
Definitions
- the invention relates to a robot for cleaning the exterior of tubes of a heat exchanger, in particular of a heat exchanger directly heated in a furnace.
- a fluid is heated by flowing through a heat exchanger, also referred to as convection bank, comprising a bundle of tubes over which pass the flue gases of a furnace.
- the tubes are bare radiant tubes having smooth outer surfaces, while in others each tube is a finned convection tube having closely spaced fins projecting from its outer surface to increase the surface area of the tube and thereby improve the heat transfer.
- EP 2691726 which is believed to represent the closest prior art to the present invention, describes a robot for cleaning the exterior of a furnace heat exchanger that includes a bundle of tubes heated by the flue gases of a heater furnace.
- the robot comprises a motorised carriage which is guided for movement along the outer surface of the bundle in a direction parallel to the tubes.
- a holder is attached to the carriage for holding a lance in a position relative to the carriage that permits the lance to penetrate between the tubes of the bundle and the lance is advanced along the heat exchanger by the carriage while remaining in the latter position.
- a robot for cleaning the exterior of tubes of a heat exchanger comprising a lance for directing a jet of fluid into spaces between the tubes, a carriage for transporting the lance in a direction of travel parallel to axes of the tubes of the heat exchanger, and traction assemblies for engaging the tubes to enable the carriage to be advanced along the tubes, characterized in that two traction assemblies are provided and located on opposite sides of the carriage, at least one of the traction assemblies being movable relative to the carriage in a direction transverse to that of travel in order to change the track width of the robot.
- the two traction assemblies are moveable relative to the carriage independently of one another.
- the invention is an improvement of the robot disclosed in EP 2691726 in that it allows the track width of the robot to be adjusted while correctly maintaining the position of the lance. Such adjustment may be required for several reasons.
- the minimum track width of the robot may be even less than the width of the carriage, thereby minimising the size of the required access hole.
- the traction assemblies of the robot may each comprise a sub-frame supporting a motor and two or more wheels driven by the motor.
- the wheels may be fitted with tyres or more preferably with a continuous caterpillar track.
- the use of a continuous track enables maximum contact between the traction assembly and the tube of the furnace.
- the large contact area also reduces the risk of the robot falling from the tubes if one of the tubes is bent.
- the term“track width” as used herein refers only to the separation of the points of contact between the traction assemblies and the tubes of the heat exchanger and should not be taken to imply that the traction assemblies necessarily include caterpillar tracks.
- the two traction assemblies of the robot are preferably movable independently of one another in a direction transverse to the travel direction and relative to the carriage.
- independent adjustment of the traction assemblies allows them both to maintain contact with the tubes, whilst at the same time not moving the position of the carriage laterally. In this way, it is possible to maintain the lance centred between adjacent tubes.
- a track width adjustment mechanism may be provided for moving at least one traction assembly relative to the carriage, which adjustment mechanism comprises a threaded shaft, a mounting block having a threaded portion in threaded engagement with the shaft, and a motor for rotating one of the shaft and the mounting block to cause the block to move relative to the length of the shaft, wherein one of the shaft and the block is secured to the carriage and the other to the traction assembly.
- the motor of the track width adjustment mechanism may be located on an upper side of the carriage and the threaded shaft may be located on an underside of the carriage.
- the motor may be connected to rotate the shaft by a chain and sprocket transmission.
- Figure l is a perspective view showing the general configuration of a robot
- Figure 2 is a rear view showing the mechanism for moving one of the traction assemblies of the robot
- Figure 3 is a side view of the robot
- Figure 4 is a top view of the robot illustrating mechanisms for moving the two traction assemblies separately relative to the carriage, in which, for clarity, the carriage is shown as being transparent.
- Figure 1 shows a robot for cleaning the exterior of tubes in a heat exchanger of a furnace.
- the robot comprises a carriage 10, two traction assemblies 12a, 12b, and a track width adjustment mechanism for moving the traction assemblies 12a, 12b apart.
- a lance (not shown) connected to a pressurised fluid supply is pivotably mounted on the carriage 10.
- the carriage 10 is a flat plate onto which other components of the robot are mounted.
- the carriage 10 is generally rectangular and features multiple holes for accepting screws, bolts, and nuts, or for allowing components to pass therethrough.
- Components attached to the carriage 10 may include covers, batteries and motors.
- the carriage 10 also supports sub-assemblies of the robot, including a lance sub-assembly and the traction assemblies 12a, 12b.
- the lance sub-assembly (not shown) comprises a lance for emitting a fluid at high pressure, and motors for rotating and/or translating the lance in order for the lance to penetrate between the tubes of the heat exchanger and to manoeuvre the lance for most efficient cleaning of the tubes.
- the position of the lance can be set to clean between tubes located either below of above the plane of the carriage.
- Each traction assembly comprises a sub-frame 20, carrying a motor connected to drive wheels or sprockets that are fitted tyres or, as shown in the drawings, with a continuous caterpillar track.
- the caterpillar tracks rest on top of the tubes of the heat exchanger and provide drive to move the robot along the tubes in order to clean the full length of the heat exchanger.
- the caterpillar tracks 12 are preferably a continuous treaded rubber belt to aid traction. Rather than caterpillar tracks, a different traction assembly may be used, using wheels in place of caterpillar tracks.
- the caterpillar tracks 12 are guided around the frame 20.
- a drive motor (not shown) is mounted within the frame 20 of each traction assembly.
- An advantage to having a motor mounted within each frame 20 is that it allows for the robot to be steered along any bent tubes by driving each track 12 at a different speed or even in a different direction.
- a possible alternative is to use two motors mounted on the carriage 10, each connected by a respective transmission to one of the traction assemblies. In an embodiment where steering is not required or is accomplished in another way, a single motor may drive both tracks 12.
- the motor of each traction assembly is accessible via an access hatch 22 (best seen in Figure 3) which is held in place by screws 24.
- the frame 20 may include a vent 26 (shown in Figure 1) to reject heat produced by the motor to prevent overheating.
- a bracket 28 is connected to the inner surface of each frame 20.
- the brackets 28 are shaped such that the robot can adopt a minimum track width configuration, in which the tracks to not project laterally beyond the carriage, without the two brackets 28 colliding or interfering with one another.
- the track width adjustment mechanism comprises a screw threaded shaft 34 which is journaled at its opposite ends in two pillow blocks 32 that are secured to the carriage 10 by screws 38.
- the bearings in the pillow blocks may be friction bearings or may include rolling bearing elements.
- a mounting block 36, in screw threaded engagement with the shaft 34, is connected to the bracket 28, so that rotation of the shaft 34 results in the bracket 28 and the track assembly moving to the left or right relative to the carriage, as viewed in Figure 2.
- the pillow blocks 32, the shaft 34, and the mounting block 36 are mounted on the underside of the carriage 10. While a drive motor 18 for rotating the shaft 34 may also be mounted on the underside of the carriage, to reduce the ride height of the carriage 10, it is mounted in the illustrated embodiment on the upper side of the carriage and torque is transmitted from the motor 18 to the shaft 34 by a chain 42 passing over sprockets 16a and 16b.
- the motor 18 rotates the upper sprocket 16a, which in turn rotates the lower sprocket 16b via a drive chain 42.
- the drive chain 42 passes through a hole in the carriage 10 between the two sprockets 16a, 16b.
- the sprockets 16a, 16b may be secured for rotation with their respective shafts by any suitable means, such as a keyway, an interference fit, or a splined connection.
- the linear movement of the mounting block 36 translates into an equal linear movement of the track assembly 12a in a direction transverse to that of the direction of travel of the robot, thus enabling the track width to be adjusted. It follows that depending on which direction the motor 18 is rotated, the track 12a may be moved in an inward direction to reduce the track width of the robot, or in an outward direction to increase the track width of the robot.
- each traction assembly 12a may be moved in a direction transverse to that of the direction of travel of the robot.
- the same principles apply to the other traction assembly 12b.
- the overall configuration of such an embodiment is shown in Figure 4.
- each traction assembly 12a, 12b may be controlled by a completely independent system, it is possible for each traction assembly to be movable in a transverse direction independently.
- the traction assemblies could use the same motor if the tracks are to always be moved apart at the same time and by the same distance.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1909266.7A GB2585066B (en) | 2019-06-27 | 2019-06-27 | Tube cleaning robot |
PCT/GB2020/051528 WO2020260872A1 (en) | 2019-06-27 | 2020-06-24 | Tube cleaning robot |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3990850A1 true EP3990850A1 (en) | 2022-05-04 |
EP3990850B1 EP3990850B1 (en) | 2022-12-14 |
Family
ID=67540055
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20735665.0A Active EP3990850B1 (en) | 2019-06-27 | 2020-06-24 | Tube cleaning robot |
Country Status (6)
Country | Link |
---|---|
US (1) | US20220268536A1 (en) |
EP (1) | EP3990850B1 (en) |
CA (1) | CA3145153A1 (en) |
GB (1) | GB2585066B (en) |
PL (1) | PL3990850T3 (en) |
WO (1) | WO2020260872A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8048089B2 (en) | 2005-12-30 | 2011-11-01 | Edge Systems Corporation | Apparatus and methods for treating the skin |
EP2240099B1 (en) | 2008-01-04 | 2018-02-21 | Edge Systems LLC | Apparatus for treating the skin |
EP2967633B1 (en) | 2013-03-15 | 2018-04-25 | Edge Systems LLC | Devices for treating the skin |
EP3795204B1 (en) | 2014-12-23 | 2023-10-25 | HydraFacial LLC | Device for treating the skin using a rollerball |
USD1016615S1 (en) | 2021-09-10 | 2024-03-05 | Hydrafacial Llc | Container for a skin treatment device |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7730979B2 (en) * | 2005-11-07 | 2010-06-08 | Randy Kahrig | Method of, and apparatus for, cleaning the exterior of tubing |
GB2489909A (en) | 2011-03-28 | 2012-10-17 | Tube Tech Int Ltd | Apparatus suitable for cleaning an exterior of tubes of a heat exchanger |
-
2019
- 2019-06-27 GB GB1909266.7A patent/GB2585066B/en not_active Expired - Fee Related
-
2020
- 2020-06-24 WO PCT/GB2020/051528 patent/WO2020260872A1/en active Application Filing
- 2020-06-24 US US17/622,992 patent/US20220268536A1/en active Pending
- 2020-06-24 CA CA3145153A patent/CA3145153A1/en active Pending
- 2020-06-24 PL PL20735665.0T patent/PL3990850T3/en unknown
- 2020-06-24 EP EP20735665.0A patent/EP3990850B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
CA3145153A1 (en) | 2020-12-30 |
GB2585066B (en) | 2021-08-04 |
US20220268536A1 (en) | 2022-08-25 |
GB2585066A (en) | 2020-12-30 |
GB201909266D0 (en) | 2019-08-14 |
PL3990850T3 (en) | 2023-04-11 |
EP3990850B1 (en) | 2022-12-14 |
WO2020260872A1 (en) | 2020-12-30 |
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